15-7=8груш стало после того как 7 забрали
34-8=26положили
(<span>2y(x -2) -x²(x +2) =2*2*(2 -2) -2²*(2 +2) = -4*4 = -16</span>
- 6 1/5 : ( 3 2/5 - 1 1/3 ) = - 6 1/5 : ( 3 6/15 - 1 5/15) =
= - 6 1/5 : 2 1/15 = - 31/15 * 15/31 = - 1
- 3 2/3 * 1 1/2 - 1 2/3 * 1 1/2 =
= 1 1/2 * ( - 3 2/3 - 1 2/3 ) =
= 1 1/2 * ( - 5 1/3) =
= 3/2 * (- 16/3) = - 8/1 = - 8